Im having a lot of trouble trying to figure out how to solve this problem, any help is greatly appreciated! Thanks.

The profit (measured in dollars) of a small company has been determined to be
P(x)= 20000 (x / 100 + x^2), where x is the production level (in units).

a) Compute the marginal profit

b) Find the production level xmax that leads to the maximal profit within the range
0 ≤ x ≤ 30.

c) How many dollars of profit does the company make at that production level?

d) Does your answer change if x has to be within the range 0 ≤ x ≤ 10 instead? If yes, how?

June 25th 2010, 01:40 AM

SpringFan25

a)
the marginal profit is

b)
maximal profit occurs either at the point where marginal profit = 0, or x=0, or x=30.

Find the profit at each of these points and see which one is higherhintThere is no point in the range 0 < x < 30 where marginal profit =0 in this case.

c)
this is equal to P(x), where x is the production level you found in part b

d)
if your existing answer is in the range 0 < x< 10, then it will not change.

However if your existing answer is not in the range, you need to find a new one, which will be either:
x=0
x=10
or somewhere in between where the marginal profit is zero (you can discount this possibility as if there was a point in the range with marginal profit =0, you would have found it in part b)

June 25th 2010, 09:07 AM

daftmau5

Thanks so much for your help!

Please let me know if these answers are correct:
A.)20000 [(100-x^2)/(100+x^2)^2]
B.)x=10
c)p=1000
d.) No, because in the previous problem, 10 had the highest amount of profit.

June 25th 2010, 11:31 AM

SpringFan25

hmm, if i understood your function correctly i dont think you have the marginal profit right